Time counting clock generator

Details Time counting clock generator Time counting clock generator

1980-11-19

1982-12-07

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Miscellaneous

242186, G11B 1926, G11B 1554, G11B 1544

Patent

active

043630480

ABSTRACT:
A counting clock generator for a video tape recorder, in which two different phase counter clock signals at a pulse repetition frequency corresponding to the running speed of a tape are processed to obtain a direction detection signal indicating the direction of running of the tape and a clock signal at a frequency of predetermined times that of the two different phase counter clock signals, and the clock signal thus obtained is counted by a reversible counter, which is controlled for switching between up-counting and down-counting by the direction detecting signal with data "0" preset when the tape is running forward and data "maximum value" preset when the tape is running backward, for producing two revised counter clock signals of different phases according to the count output signal from the reversible counter.

REFERENCES:
patent: 3681523 (1972-08-01), Sidline
patent: 4037260 (1977-07-01), Busby, Jr. et al.
patent: 4139872 (1979-02-01), Tachi
patent: 4146910 (1979-03-01), Oliver et al.
patent: 4157488 (1979-06-01), Allan
patent: 4161001 (1979-07-01), Sakamoto
patent: 4215378 (1980-07-01), Sato et al.

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